Date: Wed, 9 Jun 2010 12:23:30 GMT From: Dmitriy Demidov <dima_bsd@inbox.lv> To: freebsd-gnats-submit@FreeBSD.org Subject: misc/147720: ipfw dynamic rules and fwd Message-ID: <201006091223.o59CNUql062418@www.freebsd.org> Resent-Message-ID: <201006091230.o59CU4Ds039883@freefall.freebsd.org>
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>Number: 147720 >Category: misc >Synopsis: ipfw dynamic rules and fwd >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Jun 09 12:30:04 UTC 2010 >Closed-Date: >Last-Modified: >Originator: Dmitriy Demidov >Release: FreeBSD 7-STABLE >Organization: >Environment: FreeBSD evo.local.home 7.3-PRERELEASE FreeBSD 7.3-PRERELEASE #0: Sat Feb 20 22:57:09 EET 2010 root@evo.local.home:/usr/obj/usr/src/sys/STABLE i386 >Description: There is one bug with ipfw keep-state rules and fwd action. You are unable to make source based routing of incoming connections using this ruleset: ======= # $ext_if1 - ISP1 # $gw1 - ISP1 GW # $ext_if2 - ISP2 # $gw2 - ISP2 GW # $int_if - internal net ipfw add 100 skipto 300 tag 1 in recv $ext_if1 keep-state ipfw add 200 skipto 300 tag 2 in recv $ext_if2 keep-state ipfw add 300 allow { recv $ext_if1 or recv $ext_if2 } ipfw add 400 allow in recv $int_if ipfw add 500 fwd $gw1 tagged 1 ipfw add 600 fwd $gw2 tagged 2 ======= To make it working you should patch /sys/netinet/ipfw/ip_fw2.c with this: ==== (find this line) if (!q || dyn_dir == MATCH_FORWARD) (change it to this) if (sa->sin_port && (!q || dyn_dir == MATCH_FORWARD)) ==== This problem is presend in FreeBSD 9-CURRENT as well. Can somebody please merge this patch to CURRENT? Credits for this patch goes to Vadim Goncharov nuclight.livejournal.com/124348.html >How-To-Repeat: have FreeBSD host with two NIC's connected to different networks with different GW each. Applay ipfw rules from example provided. Start some service (SSH/Apache/etc). Make a try to connect to connect to service from network behing GW that is not configured as default gateway on FreeBSD host - answer will go via second NIC/default GW. keep-state ruleset do not works. >Fix: applay patch >Release-Note: >Audit-Trail: >Unformatted:
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